*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.w100{
    width: 100%;
}
.h100{
    height: 100%;
}

.flex{
    display: flex;
}
.flex-center{
    display: flex;
    align-items: center;
}
.flex-between{
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.flex-wrap{
    flex-wrap: wrap;
}
.flex-around{
    display: flex;
    align-items: center;
    justify-content: space-around;
}